Originally Posted by
tono06854 Network settings I tried resetting. What's dfu?
Make sure everything is backed up prior to this.
Plug your phone into iTunes. Hold in both buttons until you see the apple logo. Let go of the power button. Then once you see the plug logo let go of the home button.
This will completely wipe your phone.
Your best bet will be to do a clean install but then you will have to re enter everything.